ADM-XRC SDK 2.4.0 User Guide (Linux)
© Copyright 2001-2004 Alpha Data
XRC | XRC-P | XRCII-Lite | XRCII | XRCIIPro-Lite | XRCIIPro | WRCII | DRCII |
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$ADMXRC_SDK4/fpga/vhdl/dll
The DLL FPGA design demonstrates the clock doubling capability of Virtex DLLs and Virtex-II DCMs. The local bus clock (LCLK) is input through a clock IOB and doubled using a DLL (Virtex/-E/-EM) or DCM (Virtex-II or Virtex-IIPro). A 32-bit host-readable counter is clocked by a 2X multiple of LCLK.
Count register (COUNT, local bus address 0x0) | |||
Bits | Mnemonic | Type | Function |
31:0 | N | R/W | Number of elapsed cycles of 2X multiple of LCLK |
The COUNT register returns the number of elapsed cycles of the 2X multiple of LCLK. It can be preset to a particular value by writing to it.
For a list of the VHDL source files, refer to the appropriate XST project file, as referenced in the following table:
Model | XST script file | XST project file | UCF file |
XRC with Virtex | dll-xrc-v.scr | dll-xrc-v.prj | dll-xrc.ucf |
XRC with Virtex-E | dll-xrc-ve.scr | dll-xrc-ve.prj | dll-xrc.ucf |
XRC-P with Virtex | dll-xrcp-v.scr | dll-xrcp-v.prj | dll-xrcp.ucf |
XRC-P with Virtex-E | dll-xrcp-ve.scr | dll-xrcp-ve.prj | dll-xrcp.ucf |
XRCII-Lite | dll-xrc2l-v2.scr | dll-xrc2l-v2.prj | dll-xrc2l.ucf |
XRCII | dll-xrc2-v2.scr | dll-xrc2-v2.prj | dll-xrc2.ucf |
XRCIIPro-Lite | dll-xrc2pl-v2p.scr | dll-xrc2pl-v2p.prj | dll-xrc2pl.ucf |
WRCII | dll-wrc2-v2.scr | dll-wrc2-v2.prj | dll-wrc2.ucf |
DRCII | dll-drc2-v2.scr | dll-drc2-v2.prj | dll-drc2.ucf |
Project Navigator projects can be found in the projnav directory as follows:
Model | Project Navigator project file |
XRC | projnav/xrc/<device> |
XRC-P | projnav/xrcp/<device> |
XRCII-Lite | projnav/xrc2l/<device> |
XRCII | projnav/xrc2/<device> |
XRCIIPro-Lite | projnav/xrc2pl/<device> |
WRCII | projnav/wrc2/<device> |
DRCII | projnav/drc2/<device> |